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ive looked into this before a couple of times...here i go again....there is a colt 9mm upper for sale...bolt appears to be ramped (not sure if this is now a factory colt thing--it appears so)...
im looking for a drop in hahn mag well and i need a 9mm buffer....otherwise im GTG right?
dont...

This subject has been discussed here many times... But I just picked up a used DOE upper. So I am now able to compare first hand the OEM SMG bolt to the custom ramped/weighted bolts I have been using for 9mm M16 set ups with RDIAS. Some obvious differences there. Looking forward to seeing if...